• Title/Summary/Keyword: LLC Resonant Converter

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Design Consideration of LLC resonant converter (LLC 공진형 컨버터의 설계)

  • Choi Hang-Seok
    • Proceedings of the KIPE Conference
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    • 2006.06a
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    • pp.50-52
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    • 2006
  • This paper presents design consideration for LLC resonant converter utilizing the leakage inductance and magnetizing inductance of transformer as resonant components. The leakage inductance in the transformer secondary side is also considered in the gain equation. The design procedure is verified through experimental results.

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Operational Characteristics of A Bidirectional SLLC Resonant Converter Using Auxiliary Switches and Inductor (보조스위치와 보조인덕터 적용 양방향 SLLC 공진컨버터 동작특성)

  • Heo, Y.C;Joo, J.S;Lee, J.C;Kim, E.S
    • Proceedings of the KIPE Conference
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    • 2016.07a
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    • pp.405-406
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    • 2016
  • A bidirectional secondary LLC resonant converter with auxiliary switches and an additional inductor is proposed to achieve the high gain characteristics of LLC resonant convertors. Auxiliary switches, an additional inductor and a resonant capacitor are connected in the high voltage secondary side of the proposed converter. The ac analysis and operating characteristics of bidirectional secondary LLC resonant converter are investigated. A 1kW prototype bidirectional secondary LLC resonant converter connected to the $400V_{DC}$ buses is designed and tested to confirm the validity and applicability of the proposed converter.

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A Novel Two Phase Interleaved LLC Series Resonant Converter using a Phase of the Resonant Capacitor

  • Yi, Kang-Hyun;Moon, Gun-Woo
    • Journal of Power Electronics
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    • v.8 no.3
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    • pp.275-279
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    • 2008
  • An LLC series resonant converter has many unique characteristics and improvements over PWM topologies. However, many output capacitors are needed in parallel to satisfy output voltage ripple and the rated ripple current of the capacitors. This paper deals with a novel two phase interleaved LLC resonant converter using a phase of the resonant capacitor. The proposed converter can satisfy output voltage ripple and a rated ripple current of capacitors with few output capacitors, relatively. The operation and features are considered in detail and a prototype with a 12V-100A output is investigated.

Novel two phase interleaved LLC series resonant converter using a phase of the resonant capacitor

  • Yi, Kang-Hyun;Moon, Gun-Woo;Heo, Tae-Won
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.526-528
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    • 2008
  • LLC series resonant converter has many unique characteristics and improvement over PWM topologies. However, many output capacitors should be needed in parallel to satisfy an output voltage ripple and a rated ripple current of the capacitors. This paper is deal with a novel two phase interleaved LLC resonant converter using a phase of the resonant capacitor. The proposed converter can satisfy output voltage ripple and a rated ripple current of capacitors with few output capacitors, relatively. The operation and features is considered in detail and a prototype with a 12V-100A output is investigated.

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A Wide Input Voltage And Output Load Range LLC Resonant Converter with Two Resonant Tanks (두 개의 공진탱크를 적용한 넓은 입력전압 및 부하 제어범위를 가지는 LLC 공진컨버터)

  • Yoon, Kwang-Ho;Chung, Bong-Gun;Jang, Sang-Ho;Lee, Seung-Min;Kim, Eun-Soo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.15 no.6
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    • pp.466-476
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    • 2010
  • In this paper, for the notebook adapter with power level below approximately 60W, a novel LLC resonant converter preceded by diode rectifier with a capacitor filter is presented. Due to the switching operation of the auxiliary switching device, the proposed LLC resonant converter can deliver power with the high efficiency characteristics from the universal line(110VAC/220VAC) and load conditions. The operating schemes on the proposed converter are analyzed and described. A 60W prototype product is built, tested and verified.

LLC resonant half-bridge DC-DC converter with synchronous rectifier (동기정류기를 적용한 LLC 공진형 하프브릿지 DC-DC 컨버터)

  • Lee, Gwang-Taek;Ahn, Tae-Young
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1392-1394
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    • 2005
  • In this paper results of the experiment which used LLC resonant Half Bridge DC-DC converter to a portable electrical equipment. LLC resonant Half Bridge DC-DC converter which was used in this experiment improved an efficiency because it reduced switching, conduction losses and with synchronous rectifier. As a result of the experiment, this proposed converter could verified an increase of 2% to the efficiency more than diode rectifier.

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A Contact-less Power Supply for Photovoltaic Power Generation System (태양광 발전 시스템을 위한 무접점 전원장치)

  • Lee, Hyun-Kwan;Kong, Young-Su;Kim, Yoon-Ho;Lee, Gi-Sik;Kang, Sung-In;Chung, Bong-Geun;Kim, Eun-Soo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.11 no.3
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    • pp.216-223
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    • 2006
  • The high efficiency full-bridge LLC resonant converter using a contact-less transformer Is proposed for the photovoltaic power generation system. For the series resonance with a series capacitor, the LLC resonant converter utilizes the leakage inductance and magnetizing inductance of a contact-less transformer Unlike the conventional series resonant converter operated to the continuous resonant current at above resonance frequency, the proposed converter operates to the discontinuous resonant current at the narrow frequency control range below resonance frequency. Due to the discontinuous mode resonant current, the proposed converter can be achieved the zero voltage switching (ZVS) in the primary switches and the zero current switching (ZCS) in the secondary rectification diodes without my auxiliary circuit. In this paper, the experimental results of the proposed full-bridge LLC resonant converter using a contact-less transformer are verified on the simulation based on the theoretical analysis and the 150W experimental prototype.

Two Phase Interleaved LLC Resonant Converter (Two Phase Interleaved LLC 공진 컨버터)

  • Kim, Joo-Hoon;Lee, Kwang-Ho;Kim, Eun-Soo;Lee, Jae-Sam;Lee, Hyun-Kwan;Jung, Yong-Chae
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.5
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    • pp.397-405
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    • 2009
  • Nowadays, power supplies for LCD TV of larger and slimmer screen size are required to have high power density and high efficient characteristics. In order to meet these requirements, Multi-phase interleaved LLC resonant converter is applied for increasing power density and reducing the current rating in the used devices. In this paper, gain characteristics and the experimental results of the proposed two-phase LLC resonant converter which implemented by the simple control circuit are verified based on the theoretical analysis and the 300W experimental prototype.

Research on the Multi - purpose Nd:YAG Laser Power System using LLC Converter (LLC 공진형 컨버터를 사용한 다용도 Nd:YAG 레이저 전원장치 설계)

  • Zheng, Tao;Kim, Hee-Je;Lee, Jae-cheol;Xu, Guo-Cheng
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.6
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    • pp.885-890
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    • 2015
  • LLC resonant converter has been widely used because of its high efficiency and high energy density. In this paper, we designed a LLC resonant converter as the main power supply of the Nd:YAG pulse laser. First harmonic approximation (FHA) is used to model the LLC resonant converter. FHA equivalent circuit model and the transfer function of the LLC resonant converter is proposed. Soft start technology is also used to suppress the surge current. The laser output simulation test result is identical with the practical test, the laser energy of every pulse can reach up to 2.5J, and the pulse per second (PPS) can be adjusted from 6 to 18. The power system is verified stable and reliable by both of the simulation and experiment results.

1-stage Asymmetrical LLC Resonant Converter with Low Voltage Stress Across Switching Devices (낮은 전압 스트레스의 스위치를 가지는 1-stage 비대칭 LLC 공진형 컨버터)

  • Kim, Choon-Taek;Kim, Seong-Ju;La, Jae-Du;Kim, Young-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.8
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    • pp.1101-1107
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    • 2013
  • A light emitting diodes(LED) lighting has been increasingly used due to its low power consumption, long life time, high efficiency, and environment friendly characteristics. Also various power converters has been applied to drive these LED lighting. Among many power converters, a LLC resonant converter could be applied for LED lighting because of its high efficiency and high power density. Furthermore, the function of power factor correction(PFC) might be added. In this paper, 1-stage asymmetrical LLC resonant converter is proposed. The proposed converter performs both input-current harmonics reduction and PFC using the discontinuous conduction mode(DCM). The proposed 1-stage LLC resonant converter approach has the lower voltage stress across switching devices and achieve the zero voltage switching(ZVS) in switching devices. To verify the performance of the proposed converter, simulation and experimental results from a 300[W] prototype are provided.